Journal
SCIENCE
Volume 344, Issue 6183, Pages 508-509Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1249534
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Funding
- Biological and Environmental Research program, Office of Science, U.S. Department of Energy
- Western Regional Center of the National Institute for Climatic Change Research
- Irish Research Council
- Marie Curie Actions under the Seventh Framework Program (FP7)
- U.S. Department of Energy, Terrestrial Ecosystem Sciences [DE SC0008270]
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Soils contain the largest pool of terrestrial organic carbon (C) and are a major source of atmospheric carbon dioxide (CO2). Thus, they may play a key role in modulating climate change. Rising atmospheric CO2 is expected to stimulate plant growth and soil C input but may also alter microbial decomposition. The combined effect of these responses on long-term C storage is unclear. Combining meta-analysis with data assimilation, we show that atmospheric CO2 enrichment stimulates both the input (+19.8%) and the turnover of C in soil (+16.5%). The increase in soil C turnover with rising CO2 leads to lower equilibrium soil C stocks than expected from the rise in soil C input alone, indicating that it is a general mechanism limiting C accumulation in soil.
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